This began happening after installing iOS7. It seems to be a little different than the basic messages bug that was fixed. I send a message to the person, they reply and it is put in a group message including my email like ( " firstname.lastname@example.org ). I then get a send failure if I try replying in the group message. I have to go back to the previously okay one-to-one message thread and reply, to which the reply from the other person once again goes to the group message. Really frustrated.
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